GroupBy Bool adds "= 1 = 1" to the Generated SQL

[SniperED007]

Describe what is not working as expected.

When including a GroupBy column that is a Bool it adds a "= 1 = 1" after the Bool column in the Group By clause to the generated SQL (i.e. [x.Location].[IsOcean] = 1 = 1). Should not have the "=1 =1" at all.

          var locations = await _context.tb_ChallengeAttempt
          .Include(x => x.Location)
          .GroupBy(t => new
          {
            t.Location.IsOcean,
            t.Location.CountryCode
          })
          .Select(s => new
          {
            s.Key.IsOcean,
            CountryCode = s.Key.CountryCode.ToLower()
          })
          .ToListAsync();

SELECT [x.Location].[IsOcean], LOWER([x.Location].[CountryCode]) AS [CountryCode]
FROM [tb_ChallengeAttempt] AS [x]
LEFT JOIN [tb_Location] AS [x.Location] ON [x].[LocationId] = [x.Location].[Id]
GROUP BY [x.Location].[IsOcean] = 1 = 1, [x.Location].[CountryCode]

Exception message:

System.Data.SqlClient.SqlException (0x80131904): Incorrect syntax near '='.
   at System.Data.SqlClient.SqlCommand.<>c.<ExecuteDbDataReaderAsync>b__122_0(Task`1 result)
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteAsync(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary`2 parameterValues, CancellationToken cancellationToken)
ClientConnectionId:36989bed-2396-454f-802a-43dd79549df3
Error Number:102,State:1,Class:15

Further technical details

EF Core version: Microsoft.EntityFrameworkCore.SqlServer 2.2.3
Database Provider: Microsoft.EntityFrameworkCore.SqlServer
Operating system: Windows 10
IDE: Visual Studio 2017